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FREE Star Ruler 2
About this game:

Massive scale 4X-RTS set in space. Control hundreds of planets, manipulate galactic politics, research numerous advanced technologies, and command thousands of units and hundreds of planets in your quest for galactic dominance.

The code and art are all open source and available on GitHub, so it can be played free. However, the music is not open source and needs you to buy a copy for that.

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